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Detailed afterglow modelling and host galaxy properties of the dark GRB 111215A

Van der Horst, AJ and Levan, AJ and Pooley, GG and Wiersema, K and Krühler, T and Perley, DA and Starling, RLC and Curran, PA and Tanvir, NR and Wijers, RAMJ and Strom, RG and Kouveliotou, C and Hartoog, OE and Xu, D and Fynbo, JPU and Jakobsson, P (2015) Detailed afterglow modelling and host galaxy properties of the dark GRB 111215A. Monthly Notices of the Royal Astronomical Society, 446 (4). pp. 4116-4125. ISSN 0035-8711

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Abstract

Gamma-ray burst (GRB) 111215A was bright at X-ray and radio frequencies, but not detected in the optical or near-infrared (nIR) down to deep limits. We have observed the GRB afterglow with the Westerbork Synthesis Radio Telescope and Arcminute Microkelvin Imager at radio frequencies, with the William Herschel Telescope and Nordic Optical Telescope in the nIR/optical, and with the Chandra X-ray Observatory. We have combined our data with the Swift X-Ray Telescope monitoring, and radio and millimetre observations from the literature to perform broad-band modelling, and determined the macro- and microphysical parameters of the GRB blast wave. By combining the broad-band modelling results with our nIR upper limits we have put constraints on the extinction in the host galaxy. This is consistent with the optical extinction we have derived from the excess X-ray absorption, and higher than in other dark bursts for which similar modelling work has been performed.We also present deep imaging of the host galaxy with the Keck I telescope, Spitzer Space Telescope, and Hubble Space Telescope (HST), which resulted in a well-constrained photometric redshift, giving credence to the tentative spectroscopic redshift we obtained with the Keck II telescope, and estimates for the stellar mass and star formation rate of the host. Finally, our high-resolution HST images of the host galaxy show that the GRB afterglow position is offset from the brightest regions of the host galaxy, in contrast to studies of optically bright GRBs. © 2014 The Authors.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 23 May 2017 12:26
Last Modified: 08 Sep 2017 06:45
DOI or Identification number: 10.1093/mnras/stu2407
URI: http://researchonline.ljmu.ac.uk/id/eprint/6559

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